Trying to move Dahua cameras from subnet to main LAN

P

Paddy132a

n3wb
Jan 24, 2025
2
0
Australia
Hello

I have 5 Dahua cameras connected to a Dahua NVR.

My main LAN is on 192.168.0.xxx, whereas the cameras are on Dahua-defined subnet 10.1.1.xxx.

I need to move that cameras onto the main LAN but cannot get it to work.

I have accessed the web page of each camera individually and set the Static IP address and gateway to the main LAN. However, when I reboot the cameras and NVR, the cameras return to the Dahua subnet.

Any suggestions would be appreciated.

regards
Paddy
 
Why?

Most likely the NVR has a PoE switch built in, meaning the cameras plug directly into the NVR. In this scenario the NVR is going to set the cameras to whatever IP it wants and you can't do much about it. This configuration is a bit more secure as the cameras are isolated from the rest of your network. There's a function in the NVR web interface that allows you to access the camera configuration web pages through the NVR by clicking a button that looks like the internet explorer logo.

If you have an NVR without a built in PoE switch, you should be able to do it. But again the question is why. Using your own PoE switch you may be able to add cameras connected to the NVRs LAN port instead of the camera ports and it may not change the IP, if it did you could connect directly to the cameras using multihoming.
 
You would have to change the 10.1.1.xxx IP address of the internal POE switch of the Dahua to an IP address in the 192.168.0.xxx segment. This is not recommended.
I believe this is how you up get exposed to hacking.
If you want your cams on the 192.168.0.xxx LAN you'd need a seperate POE switch and the re-add/search for your cameras as remote devices.
 
I have a Dahua/ OEM Amcrest 4116.
this is the menu where you would add the cameras that you create Static IP's on using "device search" or " remote device search" depending on the model and firmware.
But you'd need a external POE switch. ( like I'm using) I find the cameras respond more quickly to logins when they are OFF the NVR ports.
1737793840885.png
 
you can try it by changing this IP and adding your routers LAN gateway address.
But you will have attempts by denial of Service Bots from what I'm told to get into your system.
image_2025-01-25_023804879.png
 
I don't recommend changing the IP of the internal PoE switch

You need an external switch like this one. (minumum power)

Or this one with plenty of power

When you set the camera to static and assign it an IP on your LAN network, hit SAVE, then IMMEDIATELY unplug it from the NVR and plug it into the new external switch.
All cameras AND the NVR should plug into this new switch
The cable that was connected to your NVR LAN port should now be connected to the LAN port on the new switch.
 
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tangent said:
Why?

Most likely the NVR has a PoE switch built in, meaning the cameras plug directly into the NVR. In this scenario the NVR is going to set the cameras to whatever IP it wants and you can't do much about it. This configuration is a bit more secure as the cameras are isolated from the rest of your network. There's a function in the NVR web interface that allows you to access the camera configuration web pages through the NVR by clicking a button that looks like the internet explorer logo.

If you have an NVR without a built in PoE switch, you should be able to do it. But again the question is why. Using your own PoE switch you may be able to add cameras connected to the NVRs LAN port instead of the camera ports and it may not change the IP, if it did you could connect directly to the cameras using multihoming.
Click to expand...
Many thanks for all the comments

Yes, the NVR has a POE Switch and it is set to 10.1.1.1 and it seems that it cannot be changed (without maybe a factory reset of the NVR?)

My reason for trying to move the cameras to my main LAN is that I want to try Synology Surveillance - I had hoped that I could use both the Dahua NVR and the Synology Surveillance in parallel - maybe I need to dump the Dahua NVR and go straight to the main LAN router so that Synology Surveillance can find them.

thanks again for your help everyone.

regards
Paddy

ps. any comments on Synology Surveillance?
 
bigredfish said:
I don't recommend changing the IP of the internal PoE switch

You need an external switch like this one. (minumum power)

Or this one with plenty of power

When you set the camera to static and assign it an IP on your LAN network, hit SAVE, then IMMEDIATELY unplug it from the NVR and plug it into the new external switch.
All cameras AND the NVR should plug into this new switch
The cable that was connected to your NVR LAN port should now be connected to the LAN port on the new switch.
Click to expand...

A Dahua NVR with built in PoE switch offers BOTH options. You don't HAVE to use the NVR PoE ports
OR You can mix them using some of the NVR ports and have other cameras on an external switch on your LAN
 
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^^^^
Another option for sure.
 
Just to clarify what has been said regarding using a separate POE switch:
  • Connect NVR LAN to POE switch, connect POE switch to router (if any).
  • As stated, log into each camera's webGUI and configure with a unique, static IP in that same subnet as the NVR's LAN subnet BUT outside of the router's (if any) DHCP pool.
  • Do NOT plug any camera back into a NVR POE port, plug into the new POE switch.
  • Add cameras one at a time to NVR in NVR's menu page using attached mouse and monitor OR via NVR's webGUI using PC plugged into POE switch.
 
tangent said:
In this scenario the NVR is going to set the cameras to whatever IP it wants and you can't do much about it
Click to expand...
Does it do this via ARP? My Amcrest cameras have this checkbox:

1737827511514.png

I wonder un-checking this box would prevent the NVR from forcibly adopting the cameras.
 
I do it all the time as I described. Takes a whopping 2 minutes
 
tangent said:
It may use that, but can also set it using ONVIF. The bottom line is NVRs generally expect to manage the cameras connected to them.
Click to expand...
But doesn't ONVIF require a login? How would the NVR log into the camera if the IP address has been changed?
 
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